DueBarn

When to breed calculator

Pick the month you want babies — get the day to breed.
Count back the length of her pregnancy from the day you want the birth.
Which animal?
When do you want the kids?
Pick the day you want the birth to see when to breed.
Example: for goat kids around March 1, breed on October 2 — any day from September 27 to October 7 keeps March 1 in her window.

Questions

How do I plan the month my animals are born?

Count back the length of her pregnancy from the day you want the birth. Example: for goat kids around March 1, breed on October 2 — any day from September 27 to October 7 keeps March 1 in her window.

Why is there a span of days to breed?

Every animal carries a few days more or less than the average. Breeding on any day of the span keeps your wanted birth day inside her normal window.

Sources

Pregnant cows, timing of pregnancy, open cows
University of Nebraska–Lincoln, UNL Beef
Beef Cattle Reproduction and Genetics
Penn State Extension
Rancher Notebook: Gestation Table
Montana State University Extension Beef Cattle Program
When will my doe kid?
Cornell University, NYS 4-H Animal Science
Gestation Calculator
American Boer Goat Association
Table: Approximate Gestation Periods
Merck Veterinary Manual (MSD Veterinary Manual)
Nigerian Dwarf Goats (breed brochure)
Nigerian Dwarf Goat Association
CR-703: Sheep Production: Birth to Weaning
New Mexico State University Cooperative Extension
Sheep Reproduction
Montana State University Extension Sheep Program
VA-30-W: Your Sow is Expecting
Purdue University College of Veterinary Medicine / Purdue Extension
Raising Pigs 1: Farrowing
Penn State Extension
Prediction of Foaling and Normal Foaling
Colorado State University Equine Reproduction Laboratory
G1874: The Foaling Mare
University of Nebraska–Lincoln Extension
EC 1655: Raising Rabbits for Meat: Providing Basic Care
Oregon State University Extension
Recommendations for the Care of Rabbits and Cavies
American Rabbit Breeders Association
Rabbit Breeding and Management: A Guide for Producers
Utah State University Extension
Pregnancy in Dogs
VCA Animal Hospitals
Pregnancy and Parturition in Cats
VCA Animal Hospitals
Cat pregnancy
International Cat Care
Last checked September 30, 2026. A common guide — your vet’s plan wins.

More calculators

Cow gestation calculator
Type the date she was bred: the calving date, the likely window and what to do before.
Chicken egg hatching calculator
The day to candle, the lockdown day and the hatch day for your incubator.
Goat gestation calculator
Type the date she was bred: the kidding date, the likely window and what to do before.
Dog pregnancy calculator
Type the date she was bred: the whelping date, the likely window and what to do before.
All calculators and the gestation chart
DueBarn for iPhone
Remembers every animal’s due date and reminds you before each job — the pregnancy check, the pen, the watch. Coming to the App Store this winter.